Replace HashMap, HashSet with FxHashMap and FxHashSet

crates/ra_editor/Cargo.toml

@@ -8,6 +8,7 @@ publish = false
 itertools = "0.7.8"
 superslice = "0.1.0"
 join_to_string = "0.1.1"
+rustc-hash = "1.0"
 
 ra_syntax = { path = "../ra_syntax" }
 

crates/ra_editor/src/completion.rs

@@ -1,4 +1,4 @@
-use std::collections::{HashSet, HashMap};
+use rustc_hash::{FxHashMap, FxHashSet};
 
 use ra_syntax::{
     File, TextUnit, AstNode, SyntaxNodeRef, SyntaxKind::*,
@@ -96,7 +96,7 @@ fn complete_name_ref(file: &File, name_ref: ast::NameRef, acc: &mut Vec<Completi
 }
 
 fn param_completions(ctx: SyntaxNodeRef, acc: &mut Vec<CompletionItem>) {
-    let mut params = HashMap::new();
+    let mut params = FxHashMap::default();
     for node in ctx.ancestors() {
         let _ = visitor_ctx(&mut params)
             .visit::<ast::Root, _>(process)
@@ -114,7 +114,7 @@ fn param_completions(ctx: SyntaxNodeRef, acc: &mut Vec<CompletionItem>) {
             })
         });
 
-    fn process<'a, N: ast::FnDefOwner<'a>>(node: N, params: &mut HashMap<String, (u32, ast::Param<'a>)>) {
+    fn process<'a, N: ast::FnDefOwner<'a>>(node: N, params: &mut FxHashMap<String, (u32, ast::Param<'a>)>) {
         node.functions()
             .filter_map(|it| it.param_list())
             .flat_map(|it| it.params())
@@ -232,7 +232,7 @@ fn complete_mod_item_snippets(acc: &mut Vec<CompletionItem>) {
 }
 
 fn complete_fn(name_ref: ast::NameRef, scopes: &FnScopes, acc: &mut Vec<CompletionItem>) {
-    let mut shadowed = HashSet::new();
+    let mut shadowed = FxHashSet::default();
     acc.extend(
         scopes.scope_chain(name_ref.syntax())
             .flat_map(|scope| scopes.entries(scope).iter())

crates/ra_editor/src/folding_ranges.rs

@@ -1,4 +1,4 @@
-use std::collections::HashSet;
+use rustc_hash::FxHashSet;
 
 use ra_syntax::{
     File, TextRange, SyntaxNodeRef,
@@ -20,7 +20,7 @@ pub struct Fold {
 
 pub fn folding_ranges(file: &File) -> Vec<Fold> {
     let mut res = vec![];
-    let mut visited = HashSet::new();
+    let mut visited = FxHashSet::default();
 
     for node in file.syntax().descendants() {
         if visited.contains(&node) {
@@ -56,7 +56,7 @@ pub fn folding_ranges(file: &File) -> Vec<Fold> {
 fn contiguous_range_for<'a>(
     kind: SyntaxKind,
     node: SyntaxNodeRef<'a>,
-    visited: &mut HashSet<SyntaxNodeRef<'a>>,
+    visited: &mut FxHashSet<SyntaxNodeRef<'a>>,
 ) -> Option<TextRange> {
     visited.insert(node);
 

crates/ra_editor/src/lib.rs

@@ -2,6 +2,7 @@ extern crate ra_syntax;
 extern crate superslice;
 extern crate itertools;
 extern crate join_to_string;
+extern crate rustc_hash;
 #[cfg(test)]
 #[macro_use]
 extern crate test_utils as _test_utils;

crates/ra_editor/src/scope/fn_scope.rs

@@ -1,7 +1,5 @@
-use std::{
-    fmt,
-    collections::HashMap,
-};
+use std::fmt;
+use rustc_hash::FxHashMap;
 
 use ra_syntax::{
     SyntaxNodeRef, SyntaxNode, SmolStr, AstNode,
@@ -15,7 +13,7 @@ type ScopeId = usize;
 pub struct FnScopes {
     pub self_param: Option<SyntaxNode>,
     scopes: Vec<ScopeData>,
-    scope_for: HashMap<SyntaxNode, ScopeId>,
+    scope_for: FxHashMap<SyntaxNode, ScopeId>,
 }
 
 impl FnScopes {
@@ -25,7 +23,7 @@ impl FnScopes {
                 .and_then(|it| it.self_param())
                 .map(|it| it.syntax().owned()),
             scopes: Vec::new(),
-            scope_for: HashMap::new()
+            scope_for: FxHashMap::default()
         };
         let root = scopes.root_scope();
         scopes.add_params_bindings(root, fn_def.param_list());
@@ -242,9 +240,9 @@ struct ScopeData {
 }
 
 pub fn resolve_local_name<'a>(name_ref: ast::NameRef, scopes: &'a FnScopes) -> Option<&'a ScopeEntry> {
-    use std::collections::HashSet;
+    use rustc_hash::FxHashSet;
 
-    let mut shadowed = HashSet::new();
+    let mut shadowed = FxHashSet::default();
     let ret = scopes.scope_chain(name_ref.syntax())
         .flat_map(|scope| scopes.entries(scope).iter())
         .filter(|entry| shadowed.insert(entry.name()))